Earth is in danger, because it is approaching an army of multi-colored balls, which under force to destroy it. If you want to become a hero and save a civilization that without hesitation push button start. You will control a green ball here, which you have to hit all enemies. To do this, how to aim and select the optimum effect for a shot. For each of their sacrifice, you will receive not only points, but also the money you can spend to improve performance for their guns.